chemical reaction, is a process in which atoms of one or more substances rearrange to form one or more new substances., chemical equation, is a description of a reaction using element symbols and chemical formulas., reactants, The starting substances in a chemical reaction, products, The substances produced by the chemical reaction, law of conservation of mass, states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction..

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